/* * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * Copyright (C) 2015 EMC Corporation. All Rights Reserved. * Copyright (C) 2017 T-Platforms. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * BSD LICENSE * * Copyright (C) 2015 EMC Corporation. All Rights Reserved. * Copyright (C) 2017 T-Platforms. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copy * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * PCIe NTB Pingpong Linux driver */ /* * How to use this tool, by example. * * Assuming $DBG_DIR is something like: * '/sys/kernel/debug/ntb_perf/0000:00:03.0' * Suppose aside from local device there is at least one remote device * connected to NTB with index 0. *----------------------------------------------------------------------------- * Eg: install driver with specified delay between doorbell event and response * * root@self# insmod ntb_pingpong.ko delay_ms=1000 *----------------------------------------------------------------------------- * Eg: get number of ping-pong cycles performed * * root@self# cat $DBG_DIR/count */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/device.h> #include <linux/bitops.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/hrtimer.h> #include <linux/debugfs.h> #include <linux/ntb.h> #define DRIVER_NAME … #define DRIVER_VERSION … MODULE_LICENSE(…) …; MODULE_VERSION(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; static unsigned int unsafe; module_param(unsafe, uint, 0644); MODULE_PARM_DESC(…) …; static unsigned int delay_ms = …; module_param(delay_ms, uint, 0644); MODULE_PARM_DESC(…) …; struct pp_ctx { … }; #define to_pp_timer(__timer) … static struct dentry *pp_dbgfs_topdir; static int pp_find_next_peer(struct pp_ctx *pp) { … } static void pp_setup(struct pp_ctx *pp) { … } static void pp_clear(struct pp_ctx *pp) { … } static void pp_ping(struct pp_ctx *pp) { … } static void pp_pong(struct pp_ctx *pp) { … } static enum hrtimer_restart pp_timer_func(struct hrtimer *t) { … } static void pp_link_event(void *ctx) { … } static void pp_db_event(void *ctx, int vec) { … } static const struct ntb_ctx_ops pp_ops = …; static int pp_check_ntb(struct ntb_dev *ntb) { … } static struct pp_ctx *pp_create_data(struct ntb_dev *ntb) { … } static void pp_init_flds(struct pp_ctx *pp) { … } static int pp_mask_events(struct pp_ctx *pp) { … } static int pp_setup_ctx(struct pp_ctx *pp) { … } static void pp_clear_ctx(struct pp_ctx *pp) { … } static void pp_setup_dbgfs(struct pp_ctx *pp) { … } static void pp_clear_dbgfs(struct pp_ctx *pp) { … } static int pp_probe(struct ntb_client *client, struct ntb_dev *ntb) { … } static void pp_remove(struct ntb_client *client, struct ntb_dev *ntb) { … } static struct ntb_client pp_client = …; static int __init pp_init(void) { … } module_init(…) …; static void __exit pp_exit(void) { … } module_exit(pp_exit);
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